Pt-ga bimetallic catalyst supported by ky molecular sieve, preparation method and application thereof

Abstract

The application discloses a KY molecular sieve loaded Pt-Ga bimetallic catalyst, a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing the KY molecular sieve with a precursor containing Ga components and performing first heat treatment to obtain an intermediate product; (2) mixing the intermediate product obtained in the step (1) with a precursor containing Pt components and performing second heat treatment to obtain the KY molecular sieve loaded Pt-Ga bimetallic catalyst. According to the step-by-step impregnation sequence of "Ga first and then Pt", Ga preferentially occupies ion exchange sites in the pore channel of the KY molecular sieve and anchors Pt to form Ga-Pt bimetallic active sites. When the catalyst prepared by the application is used in a straight-chain alkane aromatization reaction, the conversion rate and aromatic hydrocarbon selectivity are both significantly improved, and the catalyst can be stably operated for more than 80 hours, and the catalyst has higher catalytic activity, aromatic hydrocarbon selectivity and stability compared with the prior art.